SplitMeshWithCurve Triangulates Mesh - Why?

I have a quadmesh and a closed polyline I want to use to split it.
The edit points of the polyline match the vertices of the mesh.
I run SplitMeshWithCurve and I get a triangulated mesh.

Why does this happen? How can i split the mesh and keep the faces as they are?


MeshSplit is even worse, creates bad results…

Hi Bogdan -

That seems to be mesh-specific.

Could you post that 3dm file?

Have you tried ExtractMeshFaces, and then, perhaps, SelBrush?
-wim

Hi @wim
I attached the file for you, with a sample mesh and a curve.

SplitMeshWithCurve triangulates mesh 250711.3dm (2.3 MB)

ExtractMeshFaces with SelBrush works, but in this case I really need to define regions and use SplitMeshWithCurve. Otherwise I do the work twice: draw the polylines and ExtractMeshFaces…

(the actual model is around 5k+ quads)

Any extra feedback on this issue @wim ? Thanks!